A precise control structure for the internal air bleed system of an air compressor air cooling system

Abstract

The present invention relates to a precise control structure of an internal air intake system of an air cooling system of an air compressor, comprising an internal air intake structure, an internal cooling channel of the air compressor and an air outlet structure; the internal air intake structure comprises an air intake hole axially penetrating a thrust bearing seat of the air compressor, a first-level bearing seat air distribution groove, a gas flow control valve, a temperature sensor and a controller; the air intake hole is a trumpet hole; the internal cooling channel of the air compressor comprises a first channel of the first-level bearing seat, a first cooling groove of the thrust bearing, a second cooling groove of the thrust bearing, a first-level sealing disk air distribution groove, a second channel of the first-level bearing seat, an internal space of the motor, first and second-level connecting air ducts, a second-level bearing seat channel and a second-level sealing disk cooling groove; the beneficial effects of the present invention are: the designed air intake hole and controller can receive signals from the air outlet solenoid valve, the pressure sensor, the gas flow control valve and the temperature sensor to ensure that the gas can cool various internal parts of the air compressor; and no compressed air is wasted.

Description

Technical Field

[0001] The invention relates to an air cooling system of a compressor, in particular to a precise control structure of an internal air bleed system of an air cooling system of an air compressor. Background Art

[0002] The air cooling system of the existing air-suspended centrifugal permanent magnet motor direct-drive air compressor usually uses the intercooler as the gas source of the air cooling system, which enters the air cooling system through the connecting pipe to dissipate the heat of the permanent magnet motor and the air bearing. This method of introducing air into the cooling system through the connecting pipe has defects. Since the connecting pipe is generally a hose and is long, its layout and installation are relatively cumbersome, and there is a risk of the pipe being compressed and damaged.

[0003] In addition, the fluidity of the connecting pipe is not easy to monitor. When the connecting pipe is squeezed by external factors, the air cooling system does not have enough air flowing in, its circulation performance deteriorates, and the heat dissipation capacity decreases; in serious cases, the connecting pipe is damaged and broken, the cooling function is lost, and a large amount of heat accumulated in the air compressor cannot be dissipated in time, causing the air compressor to burn out. Therefore, how to design a precise control structure for the internal air bleed system of the air compressor air cooling system has become our current problem to be solved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a precise control structure for the internal air bleed system of an air compressor air cooling system, which can solve the problems of external cooling pipelines and prone to pipeline rupture.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] A precise control structure for an internal air intake system of an air compressor air cooling system, the air compressor comprising a casing, a volute, a first-stage impeller, a stator, a rotor, a thrust bearing seat, a second-stage sealing disk, a first-stage radial bearing seat, a second-stage radial bearing seat and a thrust plate; comprising an internal air intake structure, an air compressor internal cooling channel and an air outlet structure; the internal air intake structure is connected to the air compressor internal cooling channel; the air compressor internal cooling channel is connected to the air outlet structure; the internal air intake structure comprises an air intake hole axially penetrating the air compressor thrust bearing seat, a gas flow control valve installed at the inlet of the air intake hole, a temperature sensor arranged near the internal rotor of the air compressor and a controller; the controller is respectively connected to the gas flow control valve and the temperature sensor signal.

[0007] Furthermore, the internal air intake structure also includes a first-level bearing seat air dividing groove, a first cavity formed by a diffusion surface between the volute and the thrust bearing seat, etc.; the first-level bearing seat air dividing groove is provided on the first-level radial bearing seat; one end of the air intake hole is connected to the first cavity; and the other end of the air intake hole is connected to the first-level bearing seat air dividing groove.

[0008] Furthermore, the internal cooling channel of the air compressor includes a first branch cooling structure and a second branch cooling structure; the first branch cooling structure includes a first channel of a first-stage bearing seat, a first cooling groove of a thrust bearing, a second cooling groove of a thrust bearing, a first-stage sealing plate air distribution groove, a second channel of a first-stage bearing seat, and an internal space of the motor surrounded by the housing, the stator, and the rotor;

[0009] The first-level radial bearing seat is provided with the first-level bearing seat first channel and the second-level bearing seat second channel;

[0010] The first cooling groove of the thrust bearing is provided between the thrust plate and the first-level radial bearing seat;

[0011] A second cooling groove for the thrust bearing is provided between the thrust plate and the thrust bearing seat;

[0012] The thrust bearing seat is provided with the first-level sealing disc air distribution groove;

[0013] The first-stage bearing seat air distribution groove is connected to the first channel of the first-stage bearing seat;

[0014] The first channel of the primary bearing seat is in communication with the first cooling groove of the thrust bearing;

[0015] The first cooling groove of the thrust bearing is in communication with the second cooling groove of the thrust bearing;

[0016] The second cooling groove of the thrust bearing is connected to the gas distribution groove of the first-level sealing disk

[0017] The first-stage sealing plate gas distribution groove is connected to the second channel of the first-stage bearing seat;

[0018] The second passage of the first-level bearing seat is communicated with the internal space of the motor.

[0019] Further, the second branch cooling structure includes a first and second level connecting air duct arranged inside the top wall of the shell, a second level bearing seat channel arranged on the second level radial bearing seat, and a second level sealing disk cooling groove arranged between the second level sealing disk and the second level radial bearing seat;

[0020] The first-level bearing seat air distribution groove is connected to the first-level and second-level connecting air ducts;

[0021] The first and second level connecting air ducts are in communication with the second level bearing seat channel;

[0022] The secondary bearing seat channel is in communication with the secondary sealing disk cooling groove.

[0023] Furthermore, the air outlet structure includes an air outlet hole provided on the shell; the air outlet hole is connected to the internal space of the motor.

[0024] Furthermore, the air outlet structure also includes a pressure-stabilizing tank connected to the air outlet and a pressure sensor arranged on the shell; the pressure-stabilizing tank is provided with an air outlet solenoid valve and an air intake solenoid valve; the air intake solenoid valve is connected to the air outlet; the controller is respectively connected to the air outlet solenoid valve, the air intake solenoid valve and the pressure sensor signal.

[0025] The beneficial effects of the present invention are:

[0026] 1. Through the design of the air outlet hole and the air outlet solenoid valve arranged on the housing, Can It is a very reasonable design to adjust the internal pressure difference of the air compressor, control the air flow into the air duct, avoid excessive loss of compressed air, and detect the pressure through the pressure sensor installed on the shell.

[0027] 2. The air intake holes are set as trumpet holes in order to increase the amount of air introduced, improve the cooling effect, avoid burning the bearings and the stator and rotor, and extend the service life of the bearings and the stator and rotor.

[0028] 3. Through the air intake hole designed on the primary sealing seat, the high-pressure gas generated by the primary impeller and the volute directly enters the primary bearing seat air distribution groove through the air intake hole, and then passes through the primary and secondary connecting air ducts → the secondary bearing seat channel → the secondary sealing disk cooling groove → the internal space of the motor, the first channel of the primary bearing seat → the first cooling groove of the thrust bearing → the second cooling groove of the thrust bearing → the primary sealing disk air distribution groove → the second channel of the primary bearing seat → the internal space of the motor, the first channel of the primary bearing seat → the first cooling groove of the thrust bearing → the internal space of the motor; all the air entering the internal space of the motor is discharged from the air outlet to the outside of the air compressor shell; in this way, the cooling of various parts inside the air compressor is completed, avoiding the trouble of connecting the external cooling air duct and the problem of easy damage to the external cooling air duct;

[0029] 4. By setting up the controller, the gas flow control valve, the air outlet solenoid valve, the temperature sensor and the pressure sensor; the controller can receive the signal of the opening size of the air outlet solenoid valve, the pressure signal measured by the pressure sensor, the signal of the opening degree of the gas flow control valve and the signal of the temperature measured by the temperature sensor, and then according to the pre-written program, open the gas flow control valve according to the temperature inside the shell, open the size of the air outlet solenoid valve according to the pressure inside the shell, to ensure that the gas can cool the internal parts of the air compressor; and does not cause excess compressed air to enter the air compressor, causing the loss of compressed air output by the air compressor itself; to achieve the purpose of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a main cross-sectional view showing the structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the appearance structure of the present invention;

[0032] Figure 3 This is a control and signal feedback principle diagram of the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of each air passage of the first-stage radial bearing seat;

[0034] Figure 5 for Figure 4 Sectional view at AA;

[0035] Figure 6 It is a connection diagram of the air outlet and the air outlet flow control valve;

[0036] Figure 7 Schematic diagram of the structure of the air duct in Example 2 of the present invention.

[0037] Description of the numbers in the figure:

[0038] 1-housing, 2-stator, 3-rotor, 4-thrust bearing seat, 5-secondary sealing disk, 6-first-level radial bearing seat, 7-secondary radial bearing seat, 8-thrust disk, 10-first and second-level connecting air ducts, 11-first-level bearing seat air distribution groove, 12-first-level bearing seat first channel, 13-thrust bearing first cooling groove, 14-thrust bearing second cooling groove, 15-first-level sealing disk air distribution groove, 16-first-level bearing seat second channel, 17-motor internal space, 18-secondary bearing seat channel, 19-secondary sealing disk cooling groove, 20-volute, 21-first-level impeller, 22-air inlet hole, 23-air outlet hole. DETAILED DESCRIPTION

[0039] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end", left, right. The directions or positional relationships indicated by the terms "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "one end", "the other end" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Example 1

[0042] like Figure 1-6 As shown,

[0043] The air compressor includes a shell 1, a stator 2, a rotor 3, a thrust bearing seat 4, a secondary sealing disk 5, a primary radial bearing seat 6, a secondary radial bearing seat 7, a thrust disk 8, a volute 20, and a primary impeller 21; an internal air intake system precision control structure of an air cooling system of an air compressor, including an internal air intake structure, an internal cooling channel of the air compressor and an air outlet structure; the internal air intake structure is connected to the internal cooling channel of the air compressor; the internal cooling channel of the air compressor is connected to the air outlet structure; the internal air intake structure includes an air intake hole 22 axially penetrating the thrust bearing seat 4 of the air compressor, a gas flow control valve installed at the inlet of the air intake hole 22, a temperature sensor arranged near the rotor 3 inside the air compressor, and a controller; the controller is respectively connected to the gas flow control valve and the temperature sensor signal.

[0044] The internal air induction structure also includes a first-level bearing seat air dividing groove 11, a first cavity formed by a diffusion surface between the volute 20 and the thrust bearing seat 4; the first-level radial bearing seat 6 is provided with the first-level bearing seat air dividing groove 11; one end of the air induction hole 22 is connected to the first cavity; the other end of the air induction hole 22 is connected to the first-level bearing seat air dividing groove 11.

[0045] The internal cooling channel of the air compressor includes a first branch cooling structure and a second branch cooling structure; the first branch cooling structure includes a first channel 12 of a first-stage bearing seat, a first cooling groove 13 of a thrust bearing, a second cooling groove 14 of a thrust bearing, a first-stage sealing disk air distribution groove 15, a second channel 16 of a first-stage bearing seat, and an internal space 17 of the motor surrounded by the housing 1, the stator 2, and the rotor 3;

[0046] The first-stage radial bearing seat 6 is provided with the first-stage bearing seat first channel 12 and the first-stage bearing seat second channel 16;

[0047] The thrust bearing first cooling groove 13 is provided between the thrust plate 8 and the primary radial bearing seat 6;

[0048] The thrust bearing second cooling groove 14 is provided between the thrust plate 8 and the thrust bearing seat 4;

[0049] The thrust bearing seat 4 is provided with the first-level sealing disc gas distribution groove 15;

[0050] The first-stage bearing seat air distribution groove 11 is connected to the first-stage bearing seat first channel 12;

[0051] The first channel 12 of the primary bearing seat is connected to the first cooling groove 13 of the thrust bearing; air flows through both sides of the thrust plate 8 to cool the thrust bearings 4 on both sides of the thrust plate 8 respectively;

[0052] The first cooling groove 13 of the thrust bearing is connected to the second cooling groove 14 of the thrust bearing; air enters the gap of the first-level radial bearing seat 6 to dissipate heat for the first-level radial bearing seat 6;

[0053] The second cooling groove 14 of the thrust bearing is in communication with the gas distribution groove 15 of the primary sealing disk;

[0054] The first-level sealing plate gas distribution groove 15 is connected to the first-level bearing seat second channel 16;

[0055] The second channel 16 of the first-level bearing seat is connected to the internal space 17 of the motor; the cooling air enters the second channel 16 of the first-level bearing seat from the first-level sealing disk air distribution groove 15, and then enters the internal space 17 of the motor to cool the stator 2 and the rotor 3.

[0056] The second branch cooling structure includes a first and second connecting air duct 10 provided inside the top wall of the housing 1, a second bearing seat channel 18 provided on the second radial bearing seat 7, and a second sealing disk cooling groove 19 provided between the second sealing disk 5 and the second radial bearing seat 7;

[0057] The first-level bearing seat air distribution groove 11 is connected to the first-level and second-level connecting air ducts 10;

[0058] The first and second level connecting air duct 10 is in communication with the second level bearing seat channel 18;

[0059] The secondary bearing seat channel 18 is connected to the secondary sealing disk cooling groove 19; the cooling air cools the secondary radial bearing seat 7; the cooled air enters the internal space 17 of the motor through the bearing gap and is discharged from the air outlet structure.

[0060] like Figure 6 As shown, the air outlet structure includes an air outlet hole 23 provided on the housing 1; the air outlet hole 23 is communicated with the internal space 17 of the motor.

[0061] The air outlet structure also includes an air outlet solenoid valve fixedly connected to the air outlet hole 23 and a pressure sensor arranged on the housing 1; the controller is respectively connected to the air outlet solenoid valve and the pressure sensor signal.

[0062] The controller of the present invention is a PLC controller, and the model adopted is Siemens programmable logic controller S7-200.

[0063] like Figure 3 As shown, the control and signal feedback principle of the present invention is: the PLC controller can receive the signal of the opening size of the exhaust solenoid valve, the pressure signal measured by the pressure sensor, the signal of the opening degree of the gas flow control valve and the signal of the temperature measured by the temperature sensor, and then open the gas flow control valve and the size of the exhaust solenoid valve according to a pre-written program to ensure that the gas can cool the internal parts of the air compressor; and does not cause excess compressed air to enter the interior of the air compressor, causing the loss of compressed air output by the air compressor itself; thus achieving the purpose of energy saving and consumption reduction.

[0064] When the air compressor is working, after being pressurized by the first-stage impeller 21, the air enters the first-stage bearing seat air distribution groove 11 through the air inlet hole 22 from the cavity formed by the diffusion surface between the first-stage impeller 21 and the volute 20. The air passing through the first-stage bearing seat air distribution groove 11 is divided into two paths:

[0065] 1. One path of air enters the first channel 12 of the first-level bearing seat, and the air passing through the first channel 12 of the first-level bearing seat enters the first cooling groove 13 of the thrust bearing, and after passing through the first cooling groove 13 of the thrust bearing, it is divided into two paths; one of the paths of air passes through the second cooling groove 14 of the thrust bearing and the bearing gap of the first-level radial bearing seat 6, and directly flows into the internal space 17 of the motor, completing the cooling of the thrust bearing seat 4 and the first-level radial bearing seat 6; the other path of air enters the first-level sealing disk air dividing groove 15 from the second cooling groove 14 of the thrust bearing, completes the cooling of the thrust bearing seat 4, and then enters the second channel 16 of the first-level bearing seat, and flows into the internal space 17 of the motor; after the air entering the internal space 17 of the motor cools the stator 2 and the rotor 3, the air takes the heat out of the housing 1 of the air compressor from the air outlet 23, completing the cooling of the stator 2 and the rotor 3;

[0066] 2. Another air path passes through the first-level bearing seat air distribution groove 11 through the first-level and second-level connecting air duct 10, enters the second-level bearing seat channel 18, and then enters the second-level sealing disk cooling groove 19 to cool the second-level sealing disk 5 and the second-level radial bearing seat 7; the air passing through the second-level sealing disk cooling groove 19 enters the bearing gap of the second-level radial bearing seat 7, flows into the internal space 17 of the motor, and is finally discharged from the air outlet 23 to the outside of the air compressor housing 1.

[0067] The working process of the present invention is as follows:

[0068] After the device is installed and powered on, the rotor 3 rotates, driving the first-stage impeller 21 fixed thereto to rotate; after the first-stage impeller 21 pressurizes the air, the air enters the first-stage bearing seat air distribution groove 11 through the air inlet hole 23, and then passes through the first-stage bearing seat first channel 12 → the thrust bearing first cooling groove 13 → the motor internal space 17, the first and second-stage connecting air duct 10 → the second-stage bearing seat channel 18 → the second-stage sealing disk cooling groove 19 → the motor internal space 17, the first-stage bearing seat first channel 12 → the thrust bearing first cooling groove 13 → the thrust bearing second cooling groove 14 → the first-stage sealing disk air distribution groove 15 → the first-stage bearing seat second channel 16 → the electric The internal space 17 of the machine is used to cool various parts, avoiding the trouble of connecting the external cooling air duct and the problem that the external cooling air duct is easily damaged; the controller can receive the signal of the opening size of the exhaust solenoid valve, the pressure signal measured by the pressure sensor, the signal of the opening degree of the gas flow control valve and the signal of the temperature measured by the temperature sensor, and then according to the pre-written program, the gas flow control valve is opened according to the temperature inside the shell 1, and the size of the exhaust solenoid valve is opened according to the pressure inside the shell 1, so as to ensure that the gas can cool the internal parts of the air compressor; and no excess compressed air is caused to enter the interior of the air compressor, causing the loss of the compressed air output by the air compressor itself; so as to achieve the purpose of energy saving and consumption reduction.

[0069] Example 2

[0070] The structure of this embodiment is basically the same as that of embodiment 1, except that:

[0071] like Figure 7 As shown,

[0072] The air bleed hole 22 is a trumpet hole, and the gas flow control valve is fixedly connected to the air bleed hole 22; the trumpet end of the air bleed hole 22 faces the first-stage impeller 21. The air bleed hole 22 is set in the form of a trumpet hole to increase the amount of air introduced, improve the cooling effect, avoid burning the bearings and the stator and rotor, and extend the service life of the bearings and the stator and rotor.

[0073] The working principle of this embodiment is the same as that of Embodiment 1, and will not be described again.

[0074] Example 3

[0075] The structure of this embodiment is basically the same as that of embodiment 1, except that:

[0076] The number and position of the air bleed holes 22 are combined and positioned on the thrust bearing seat 4, and the outlet of the first-stage impeller 21, the volute 20 and the diffuser surface between them form an area as the source of the internal cooling system of the air compressor. The air bleed holes 22 are combined and positioned at the radial and circumferential positions of the diffuser surface by utilizing the distribution law of the air pressure increasing radially and circumferentially along the diffuser surface to achieve precise control of the intake flow rate, and at the same time, the number of the air bleed holes 22 is improved in the design as an auxiliary means of flow control. This embodiment can accurately control the intake flow rate, improve the cooling effect, avoid burning the bearings and stators and rotors, and extend the service life of the bearings and stators and rotors; at the same time, it achieves the purpose of avoiding wasting compressed air and saving energy, and is a relatively complete design improvement plan.

[0077] The working principle of this embodiment is the same as that of Embodiment 1, and will not be described again.

[0078] The above is only a preferred specific implementation manner of the present invention; but the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered by the protection scope of the present invention.

Claims

1. An accurate control structure for an internal air bleed system of an air compressor air cooling system, the air compressor comprising a casing, a volute, a primary impeller, a stator, a rotor, a thrust bearing seat, a secondary sealing disc, a primary radial bearing seat, a secondary radial bearing seat and a thrust plate; characterized in that: It comprises an internal air bleed structure, an internal cooling channel of an air compressor and an air outlet structure; the internal air bleed structure is in communication with the internal cooling channel of the air compressor; the internal cooling channel of the air compressor is in communication with the air outlet structure; the internal air bleed structure comprises an air bleed hole (22) axially penetrating the thrust bearing seat of the air compressor, a gas flow control valve installed at the inlet of the air bleed hole (22), a temperature sensor arranged near the rotor inside the air compressor and a controller; the controller is respectively connected to the gas flow control valve and the temperature sensor signal; The internal air intake structure further comprises a first-stage bearing seat air dividing groove (11), and a first cavity formed between the volute and the thrust bearing seat; the first-stage radial bearing seat is provided with the first-stage bearing seat air dividing groove (11); one end of the air intake hole (22) is in communication with the first cavity; the other end of the air intake hole (22) is in communication with the first-stage bearing seat air dividing groove (11); The internal cooling channel of the air compressor comprises a first branch cooling structure and a second branch cooling structure; the first branch cooling structure comprises a first channel (12) of a first-stage bearing seat, a first cooling groove (13) of a thrust bearing, a second cooling groove (14) of a thrust bearing, a first-stage sealing disk air distribution groove (15), a second channel (16) of a first-stage bearing seat, and an internal space (17) of the motor surrounded by the housing, the stator, and the rotor; The first-stage radial bearing seat is provided with the first-stage bearing seat first channel (12) and the first-stage bearing seat second channel (16); A first cooling groove (13) of the thrust bearing is provided between the thrust plate and the first-level radial bearing seat; A second cooling groove (14) of the thrust bearing is provided between the thrust plate and the thrust bearing seat; The thrust bearing seat is provided with the first-level sealing disc air distribution groove (15); The first-stage bearing seat air distribution groove (11) is in communication with the first-stage bearing seat first channel (12); The first channel (12) of the primary bearing seat is in communication with the first cooling groove (13) of the thrust bearing; The first cooling groove (13) of the thrust bearing is in communication with the second cooling groove (14) of the thrust bearing; The second cooling groove (14) of the thrust bearing is in communication with the gas distribution groove (15) of the first-stage sealing disk. The first-stage sealing disc gas distribution groove (15) is in communication with the first-stage bearing seat second channel (16); The second channel (16) of the first-level bearing seat is in communication with the internal space (17) of the motor; The second branch cooling structure comprises a first and second connecting air duct (10) provided inside the top wall of the housing, a second bearing seat channel (18) provided on the second radial bearing seat, and a second sealing disk cooling groove (19) provided between the second sealing disk and the second radial bearing seat; The first-level bearing seat air distribution groove (11) is in communication with the first-level and second-level connecting air ducts (10); The primary and secondary connecting air ducts (10) are in communication with the secondary bearing seat channel (18); The secondary bearing seat channel (18) is in communication with the secondary sealing disk cooling groove (19).

2. The precise control structure of the internal air bleed system of the air compressor air cooling system according to claim 1, characterized in that: The air outlet structure comprises an air outlet hole (23) provided on the housing; the air outlet hole (23) is in communication with the internal space (17) of the motor.

3. The precise control structure of the internal air bleed system of the air compressor air cooling system according to claim 2, characterized in that: The gas outlet structure further comprises a pressure-stabilizing tank connected to the gas outlet hole (23) and a pressure sensor arranged on the housing; the pressure-stabilizing tank is provided with a gas outlet solenoid valve and a gas inlet solenoid valve; the gas inlet solenoid valve is connected to the gas outlet hole (23); and the controller is respectively connected to the gas outlet solenoid valve and the gas inlet solenoid valve by signal.

4. The precise control structure for the internal air bleed system of the air compressor air cooling system according to claim 3, characterized in that: The air inlet hole (22) is a trumpet hole, and the trumpet end of the air inlet hole (22) faces the first-stage impeller.

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